
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkBlurMaskFilter.h"

namespace
{
SkBitmap make_bitmap()
    {
    SkBitmap bm;
    bm.setConfig(SkBitmap::kARGB_8888_Config , 5, 5);
    bm.allocPixels();

    for (int y = 0; y < bm.height(); y++)
        {
        uint32_t* p = bm.getAddr32(0, y);
        for (int x = 0; x < bm.width(); x++)
            {
            p[x] = ((x + y) & 1) ? SK_ColorWHITE : SK_ColorBLACK;
            }
        }
    bm.unlockPixels();
    return bm;
    }
} // unnamed namespace

class TextureDomainView : public SampleView
    {
        SkBitmap    fBM;

    public:
        TextureDomainView()
            {
            fBM = make_bitmap();
            }

    protected:
        // overrides from SkEventSink
        virtual bool onQuery(SkEvent* evt)
            {
            if (SampleCode::TitleQ(*evt))
                {
                SampleCode::TitleR(evt, "Texture Domain");
                return true;
                }
            return this->INHERITED::onQuery(evt);
            }

        virtual void onDrawContent(SkCanvas* canvas)
            {
            SkIRect srcRect;
            SkRect dstRect;
            SkPaint paint;
            paint.setFilterBitmap(true);

            // Test that bitmap draws from malloc-backed bitmaps respect
            // the constrained texture domain.
            srcRect.setXYWH(1, 1, 3, 3);
            dstRect.setXYWH(5.0f, 5.0f, 305.0f, 305.0f);
            canvas->drawBitmapRect(fBM, &srcRect, dstRect, &paint);

            // Test that bitmap draws across separate devices also respect
            // the constrainted texture domain.
            // Note:  GPU-backed bitmaps follow a different rendering path
            // when copying from one GPU device to another.
            SkRefPtr<SkDevice> primaryDevice(canvas->getDevice());
            SkRefPtr<SkDevice> secondDevice(canvas->createCompatibleDevice(
                                                SkBitmap::kARGB_8888_Config, 5, 5, true));
            secondDevice->unref();
            SkCanvas secondCanvas(secondDevice.get());

            srcRect.setXYWH(1, 1, 3, 3);
            dstRect.setXYWH(1.0f, 1.0f, 3.0f, 3.0f);
            secondCanvas.drawBitmapRect(fBM, &srcRect, dstRect, &paint);

            SkBitmap deviceBitmap = secondDevice->accessBitmap(false);

            srcRect.setXYWH(1, 1, 3, 3);
            dstRect.setXYWH(405.0f, 5.0f, 305.0f, 305.0f);
            canvas->drawBitmapRect(deviceBitmap, &srcRect, dstRect, &paint);

            // Test that bitmap blurring using a subrect
            // renders correctly
            srcRect.setXYWH(1, 1, 3, 3);
            dstRect.setXYWH(5.0f, 405.0f, 305.0f, 305.0f);
            SkMaskFilter* mf = SkBlurMaskFilter::Create(
                                   5,
                                   SkBlurMaskFilter::kNormal_BlurStyle,
                                   SkBlurMaskFilter::kHighQuality_BlurFlag |
                                   SkBlurMaskFilter::kIgnoreTransform_BlurFlag);
            paint.setMaskFilter(mf)->unref();
            canvas->drawBitmapRect(deviceBitmap, &srcRect, dstRect, &paint);

            // Blur and a rotation + NULL src rect
            // This should not trigger the texture domain code
            // but it will test a code path in SkGpuDevice::drawBitmap
            // that handles blurs with rects transformed to non-
            // orthogonal rects. It also tests the NULL src rect handling
            mf = SkBlurMaskFilter::Create(
                     5,
                     SkBlurMaskFilter::kNormal_BlurStyle,
                     SkBlurMaskFilter::kHighQuality_BlurFlag);
            paint.setMaskFilter(mf)->unref();

            dstRect.setXYWH(-150.0f, -150.0f, 300.0f, 300.0f);
            canvas->translate(550, 550);
            canvas->rotate(45);
            canvas->drawBitmapRect(fBM, NULL, dstRect, &paint);
            }
    private:
        typedef SkView INHERITED;
    };

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory()
    {
    return new TextureDomainView;
    }
static SkViewRegister reg(MyFactory);

